Specifications of CCITT Signalling System Number 7.
Technical information bulletin.
NATIONAL COMMUNICATIONS SYSTEM WASHINGTON DC
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This Technical Information Bulletin TIB reprints CCITT Study Group XI Document 393, which was Part III B of the Study Group XI report to the VIIth CCITT Plenary Assembly. Signalling System No. 7 is the international standard common channel signalling system for exchanging telephone signalling and supervisory information between digital telephone central offices.
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